The two-year rule — the first thing to check
To bring an unfair dismissal claim through an employment tribunal, you normally need at least two years of continuous service with your employer. If you have less than two years, you cannot bring a standard unfair dismissal claim — your employer can dismiss you without giving a reason and without it being unfair in law.
There are important exceptions. Certain reasons for dismissal are automatically unfair, and these apply from day one with no qualifying period. If your dismissal falls into one of those categories, the two-year rule does not apply. Those categories are listed below.
The five potentially fair reasons for dismissal
An employer who dismisses someone needs to show they had a fair reason. The law recognises five potentially fair reasons:
Capability. Your employer genuinely believes you cannot do the job to the required standard, whether because of lack of skill, poor performance, or ill health. The key word is genuinely — a fair process, with warnings, support, and opportunity to improve, must precede the dismissal.
Conduct. Misconduct, ranging from persistent minor misconduct after warnings to a single act of gross misconduct serious enough to justify immediate dismissal. Gross misconduct — theft, violence, serious insubordination — can justify dismissal without notice, but a fair investigation must still take place.
Redundancy. The job no longer exists. See /employment-rights/redundancy for how redundancy works and when a redundancy claim may actually be unfair dismissal in disguise.
Statutory restriction. The employee can no longer legally do the job. The most common example is a driver losing their licence.
Some other substantial reason (SOSR). A catch-all for situations that do not fit the other four categories but where there is a genuine business reason. Reorganisation that requires changed working arrangements, business closure, or a breakdown in working relationships can fall here. Tribunals scrutinise SOSR carefully.
Having a fair reason is not enough on its own. The employer must also have followed a fair procedure. If the reason was sound but the process was not, the dismissal can still be unfair.
Automatically unfair dismissal — no qualifying period required
These reasons are automatically unfair regardless of how long you have worked for your employer:
- Whistleblowing: you raised a concern about wrongdoing, illegality, or a health and safety risk in the public interest
- Pregnancy, maternity leave, or related absence
- Asserting a statutory right, such as asking for minimum wage, holiday pay, or rest breaks
- Trade union membership or activities, or taking part in protected industrial action
- Health and safety: you raised a genuine concern about a risk to yourself or others, or refused to work in dangerous conditions
- Working time: you asserted your rights under the Working Time Regulations (rest breaks, maximum working hours)
- Jury service
- Taking action under whistleblowing legislation (protected disclosure)
If your dismissal falls into any of these categories, contact ACAS, the employment advisory service, on 0300 123 1100 as soon as possible. The time limit is still three months less one day from the date your employment ended.
The procedural requirement
Even when the reason for dismissal is potentially fair, the employer must follow a fair procedure. What constitutes a fair procedure varies with the circumstances, but ACAS publishes a Code of Practice on disciplinary and grievance procedures, and employment tribunals expect employers to follow it.
The Code requires, at minimum: a proper investigation, a written notice of the allegation, a disciplinary hearing with the right to be accompanied by a colleague or trade union representative, and the right of appeal against the decision.
If an employer fails to follow the ACAS Code, the tribunal can increase any compensation awarded by up to 25%. The Code does not make a dismissal automatically unfair — but ignoring it makes it significantly more expensive for the employer if the claim succeeds.
ACAS early conciliation — the fastest route for most cases
ACAS early conciliation is not just a formality before tribunal. It is a free conciliation service where a trained conciliator works with you and your employer to try to reach a settlement. No admission of wrongdoing is required to start the process. Nothing said during conciliation is admissible in any subsequent tribunal hearing.
Many disputes — probably the majority — are resolved through ACAS conciliation without ever reaching a tribunal hearing. Employers often prefer settlement to the reputational and financial risk of a tribunal.
Start ACAS early conciliation at acas.org.uk. It is a required step before you can submit a tribunal claim. Contacting ACAS pauses your time limit while conciliation is attempted. ACAS helpline: 0300 123 1100.
Employment tribunal — the reality
If ACAS conciliation does not resolve the dispute, you can submit a claim to an employment tribunal. There are no fees for bringing an unfair dismissal claim — they were abolished in 2017. Verify the current fee position at GOV.UK, as the government has periodically proposed reintroducing fees.
Be honest with yourself about timescales. Many tribunal cases take 12 to 18 months from submission to hearing. Complex cases take longer. This is the reality of the current tribunal system, and it is worth factoring into your decision before committing to the process.
Compensation for unfair dismissal has two parts. The basic award uses the same age and service multiplier formula as statutory redundancy pay. The compensatory award is based on your actual financial loss — lost earnings, loss of benefits, future loss. The compensatory award is capped at the lower of the government's published cap or 52 weeks' pay. Verify the current cap at GOV.UK — it changes annually.
Compensation is reduced if the tribunal finds you contributed to your dismissal, or if you failed to follow the ACAS Code yourself.
When to get a solicitor
You do not need a solicitor to bring a tribunal claim. Many people represent themselves successfully. But professional advice is worth considering in these situations:
Your case involves a substantial financial claim and your employer has legal representation. The dismissal has a discriminatory element — these cases are more legally complex. You believe your dismissal falls into the automatically unfair categories and you have less than two years' service. You have been offered a settlement agreement and are being asked to sign away your rights.
On settlement agreements: you are legally required to take independent legal advice before signing one. Your employer will typically contribute toward that advice. Never sign one without taking it.
Citizens Advice can help you understand the process and prepare a tribunal claim without charge.
Get plain-English employment rights guides without the legal jargon.
Common questions about unfair dismissal
Do I need 2 years of service to claim unfair dismissal?▾
For a standard unfair dismissal claim, yes. You need at least two years of continuous employment with your employer. Before that, your employer can dismiss you without giving a reason and without it being unfair in law. The exception is automatically unfair dismissal, which applies from day one — if you were dismissed because of pregnancy, whistleblowing, trade union membership, or another protected reason, the two-year rule does not apply.
What counts as automatically unfair dismissal?▾
Dismissal is automatically unfair if the reason was pregnancy or maternity leave, whistleblowing (making a protected disclosure), asserting a statutory right such as asking for minimum wage or holiday pay, trade union membership or activities, health and safety concerns, working time rights, or jury service. These protections apply from day one — there is no qualifying period.
What are the five fair reasons for dismissal?▾
An employer can fairly dismiss for capability (you cannot do the job), conduct (misconduct up to gross misconduct), redundancy (the job no longer exists), statutory restriction (you can no longer legally do the job, such as losing a driving licence), or some other substantial reason (SOSR), which covers reorganisations and other genuine business reasons. Having a fair reason is not enough — the employer must also have followed a fair procedure.
What is ACAS early conciliation and is it mandatory?▾
ACAS early conciliation is a free service where a trained conciliator works with both parties to try to reach a settlement without going to tribunal. It is mandatory — you must contact ACAS and attempt early conciliation before you can submit an employment tribunal claim. Contacting ACAS pauses your three-month time limit while conciliation is underway. Start at acas.org.uk.
How much compensation can I get for unfair dismissal?▾
Compensation has two parts. The basic award is calculated using the same age and service formula as statutory redundancy pay. The compensatory award is based on your actual financial loss, capped at either the government's published cap or 52 weeks' pay, whichever is lower. Verify the current cap at GOV.UK — it changes each April. Your compensation can be reduced if you contributed to your dismissal, failed to mitigate your losses, or did not follow the ACAS Code yourself.
How long does an employment tribunal take?▾
Most unfair dismissal cases take 12 to 18 months from submission to hearing. Complex cases involving discrimination or multiple claimants take longer. The tribunal system is currently under significant pressure. Many cases settle before a hearing through ACAS conciliation or direct negotiation, which is usually faster. It is worth engaging seriously with conciliation for this reason.
What is the ACAS Code of Practice?▾
The ACAS Code of Practice on disciplinary and grievance procedures sets out the steps employers should follow before dismissing someone: proper investigation, written notice, a disciplinary hearing with the right to be accompanied, and a right of appeal. The Code is not law, but tribunals must take it into account. If an employer ignores the Code, any compensation awarded can be increased by up to 25%. If the employee ignores the Code, it can be reduced.
Can I be dismissed for whistleblowing?▾
No. Dismissal because you made a protected disclosure — reporting a legal breach, health and safety risk, environmental damage, or other wrongdoing in the public interest — is automatically unfair. There is no qualifying period. Protected disclosures can be made to your employer, a regulatory body, or in some circumstances to the media. The disclosure must be in the public interest, not just a personal grievance. Contact ACAS on 0300 123 1100 immediately if you believe you have been dismissed for whistleblowing.